Superfund Information Systems: Site Profile

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The Rolling Knolls Landfill site is located in Chatham, New Jersey. The nearly 200-acre area was used as an unlined landfill for just over 30 years. The privately-owned landfill, which closed in 1968, received solid waste from various parties and this waste included construction and demolition debris, household refuse and scrap metal. Landfill operations contaminated soil, sediment, surface water and groundwater with metals, polychlorinated biphenyls (PCBs), pesticides, freon compounds and volatile and semi-volatile organic compounds (VOCs). Site investigations are ongoing. EPA will develop a cleanup plan based on the findings of the investigations.

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What Has Been Done to Clean Up the Site?

In 2005, EPA entered into a legal settlement under which potentially responsible parties (PRPs) agreed to conduct and pay for a thorough investigation of site and off-site soil, groundwater and sediment. This investigation will determine the nature and extent of the contamination at the site. After completion of the investigation, the agreement also includes the performance of a study that identifies and evaluates a number of potential cleanup alternatives to address contamination found at the site. To date, EPA continues to search for additional PRPs.

EPA approved the PRPs’ investigation work plan in the summer of 2007. Field work started in July 2007. The field work included visual inspections (including test pits), background soil and groundwater sampling, and on-site surface and subsurface soil and groundwater sampling, as well as follow-up sampling in areas determined to require further exploration. Data gaps were identified and additional sampling was conducted in 2015. Biota sampling and analyses were conducted in 2016 for an ecological risk assessment. Site groundwater investigations are ongoing.

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What Is the Current Site Status?

A baseline human health risk assessment was completed in 2014 and identified potential site risks to trespassers and future residential occupants. The baseline risk assessment was evaluated in 2016 to assess data gap sampling results and the risks identified remain the same. A screening level ecological risk assessment was completed in 2013 and was followed by a baseline ecological risk assessment which is underway.

The remedial investigation to characterize the nature and extent of contamination is ongoing with an estimated completion in 2017. A feasibility study will be prepared in 2017 to identify cleanup alternatives that will address risks posed by site contamination. EPA will develop a cleanup plan after completion of the remedial investigation and feasibility study.

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